One that is definitely recommended is "Treks in Scifi." A podcast that has endured for approx. 3 years now. Episode reviews and discussions, collectible reviews, and Trek news summaries comprise each installment. Audio quality is excellent as is the quality of the content. I have listened for some time, though not for the past few months due to time constraints. In my opinion, an exemplar in podcasting, especially with regards to Star Trek.

__________________GARTH: Mister Spock, do you consider Captain Kirk and yourself brothers?
SPOCK: Captain Kirk speaks somewhat figuratively and with undue emotion. However, what he says is logical and I do, in fact, agree with it.